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4. Maintenance
A. Power Requirements
The PTC 400 operates on 4 AA alkaline batteries or optional rechargeable Ni-Cd batteries. To
replace the alkaline batteries or to install rechargeable batteries remove the two (2) screws on
the rear battery door and lift the battery cover. When using Ni-Cd batteries the AC adapter will
simultaneously power the PTC 400 and charge the batteries. A full charge will take 10- 12 hours.
The AC adapter can be used to power the unit on the bench with or without Ni-Cd batteries
installed. Never connect the AC adapter with alkaline batteries installed, be sure to remove the
alkaline batteries before using the AC adapter.
B. Field Replacement Fuse Update
PTC 400s come with a field replaceable minifuse. This fuse protects the PTC 400 from mis-
connections beyond the ratings specified for the PTC 400 inputs and outputs. If an overload
condition occurs and a blown fuse is suspected perform the following fuse check/replacement
procedure:
1. Remove the four screws on the rear of the PTC 400 that hold the enclosure together.
NOTE: Two of the screws are under the battery compartment door.
2. With the case top open, locate the two socketed mini fuses mounted near the input/output
connection jacks.
3. Remove one fuse at a time and check continuity using an ohmmeter. A good fuse will read
10 ohms or less. A blown fuse will have a very high reading and generally show as an open
circuit.
4. If a blown fuse is found replace with the enclosed spare fuse.
5. To order more fuses contact ecom instruments GmbH.
C. Calibration
The PTC 400 should hold its rated specifications for a minimum of one year. Given this, annual
re-calibration is required for best performance.
5. Specifications
T/C Ranges:
J, K, T, E, R, S, N, B, L, U including – 10 to 75 mV range
RTD Ranges:
Pt 385 (100, 200, 500, 1000 ohms)
Pt 392, JIS, Ni 120, CU10, YSI 400
Ohms Ranges:
0 to 400.00 and 400.0 to 3200.0
Accuracy:
T/C Type J: ±0.3°C ±10 µV (±0.4°C total error)
RTD PT100: ±0.1°C ±0.075 Ω (±0.3°C total error)
Ohms (400): ±0.1 Ω
Ohms (3200): ±1.0 Ω
RTD IEX-range:
0.01 mA to 3 mA
RTD Frequency Response:
10 mS – works with all pulsed XMTR’s
Oper. Temp:
-10°C to 50°C
Storage Temp:
-40°C to 60°C
Power Supply:
4 AA Alkaline Cells, 30 hours typical operating time
Size:
7.5“ x 4“ x 1.5“ (190 x 102 x 38 mm)
